Java 在facebook登录成功后启动新活动
我一直在尝试从facebook集成的成功登录尝试开始一个新活动,但是当登录pin后按下登录按钮时,它会返回到登录按钮所在的活动 我已经有了进入下一个活动的意图,但是它似乎对登录成功没有任何反应 这是我的代码(很抱歉我这么长时间都这么不整洁):Java 在facebook登录成功后启动新活动,java,android,facebook,Java,Android,Facebook,我一直在尝试从facebook集成的成功登录尝试开始一个新活动,但是当登录pin后按下登录按钮时,它会返回到登录按钮所在的活动 我已经有了进入下一个活动的意图,但是它似乎对登录成功没有任何反应 这是我的代码(很抱歉我这么长时间都这么不整洁): }请尝试使用以下代码。我希望这将对您有所帮助,请使用CamelCase符号作为类名 public class Userlogin extends AppCompatActivity implements View.OnClickListener {
}请尝试使用以下代码。我希望这将对您有所帮助,请使用CamelCase符号作为类名
public class Userlogin extends AppCompatActivity implements View.OnClickListener {
LoginButton btnFacebookLogin;
CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
callbackManager = CallbackManager.Factory.create();
setUI();
}
private void setUI() {
btnFacebookLogin = (LoginButton) findViewById(R.id.btnFacebookLogin);
btnFacebookLogin.setOnClickListener(this);
btnFacebookLogin.setReadPermissions("email", "public_profile");
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnFacebookLogin:
facebookLogin();
}
}
private void facebookLogin() {
// Callback registration
btnFacebookLogin.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
// App code
final AccessToken accessToken = loginResult.getAccessToken();
GraphRequestAsyncTask request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject user, GraphResponse graphResponse) {
LoginManager.getInstance().logOut();
username = (user.optString("name"));
}
}).executeAsync();
Toast.makeText(getApplicationContext(), "Login Success with facebook", Toast.LENGTH_SHORT).show();
startActivity(new Intent(Userlogin .this, AlertsandPlanning.class));
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
public类Userlogin扩展了AppCompatActivity实现了View.OnClickListener{
登录按钮btnFacebookLogin;
CallbackManager CallbackManager;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
sdkinInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
callbackManager=callbackManager.Factory.create();
setUI();
}
私有void setUI(){
btnFacebookLogin=(LoginButton)findViewById(R.id.btnFacebookLogin);
btnFacebookLogin.setOnClickListener(此);
btnFacebookLogin.setReadPermissions(“电子邮件”、“公共档案”);
}
@凌驾
公共void onClick(视图v){
开关(v.getId()){
案例R.id.btnFacebookLogin:
facebookLogin();
}
}
私有void facebookLogin(){
//回调注册
btnFacebookLogin.registerCallback(callbackManager,new FacebookCallback()){
@凌驾
成功时公共无效(LoginResult LoginResult){
//应用程序代码
final AccessToken AccessToken=loginResult.getAccessToken();
GraphRequestStatSyncTask请求=GraphRequest.NewMereRequest(accessToken,new GraphRequest.GraphJSONObjectCallback()){
@凌驾
未完成公共无效(JSONObject用户,GraphResponse GraphResponse){
LoginManager.getInstance().logOut();
用户名=(user.optString(“name”);
}
}).executeAsync();
Toast.makeText(getApplicationContext(),“使用facebook登录成功”,Toast.LENGTH_SHORT.show();
startActivity(新意图(Userlogin.this、AlertsandPlanning.class));
}
@凌驾
公开作废{
//应用程序代码
}
@凌驾
public void onError(facebook异常){
//应用程序代码
}
});
}
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据){
super.onActivityResult(请求代码、结果代码、数据);
callbackManager.onActivityResult(请求代码、结果代码、数据);
}
您是否面临任何错误?。如果是,请在此处发布有助于解决问题并正确分析的日志。在发布之前,上述代码未遇到错误。我有一些错误,但在分析后已更正。到目前为止,我尝试了上述代码,并得到一个错误:由以下原因引起:java.lang.NullPointerException:Attempt在com.example.bluejohnson.partymagic.UserLogin.setUI(UserLogin.java:39)的com.example.bluejohnson.partymagic.UserLogin.setUI(UserLogin.java:39)上的空对象引用上调用虚拟方法“void com.facebook.login.widget.LoginButton.setOnClickListener(android.view.view$OnClickListener)”是否已在build.gradle文件中添加Facebook依赖项并删除username=(user.optString(“name”);我认为您正在为活动设置其他布局,而不是为此活动创建的布局,您应该正确设置。
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import com.facebook.CallbackManager;
import com.facebook.login.widget.LoginButton;
import com.facebook.FacebookSdk;
import android.view.View;
import com.facebook.login.LoginResult;
import com.facebook.FacebookCallback;
import org.json.JSONObject;
import android.widget.Toast;
import com.facebook.AccessToken;
import com.facebook.login.LoginManager;
import com.facebook.GraphResponse;
import com.facebook.FacebookException;
import com.facebook.GraphRequest;
import com.facebook.GraphRequestAsyncTask;
public class UserLogin extends AppCompatActivity implements View.OnClickListener {
LoginButton btnFacebookLogin;
CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_user_login);
callbackManager = CallbackManager.Factory.create();
setUI();
}
private void setUI() {
btnFacebookLogin = (LoginButton) findViewById(R.id.FBLoginBtn);
btnFacebookLogin.setOnClickListener(this);
btnFacebookLogin.setReadPermissions("email", "public_profile");
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.FBLoginBtn:
facebookLogin();
}
}
private void facebookLogin() {
// Callback registration
btnFacebookLogin.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
final AccessToken accessToken = loginResult.getAccessToken();
GraphRequestAsyncTask request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject user, GraphResponse graphResponse) {
LoginManager.getInstance().logOut();
String username = (user.optString("name"));
}
}).executeAsync();
Toast.makeText(getApplicationContext(), "Login Success with facebook", Toast.LENGTH_SHORT).show();
Intent startAlertsAndPlanning = new Intent(UserLogin.this, AlertsAndPlanning.class);
startActivity(startAlertsAndPlanning);
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}
public class Userlogin extends AppCompatActivity implements View.OnClickListener {
LoginButton btnFacebookLogin;
CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(getApplicationContext());
setContentView(R.layout.activity_main);
callbackManager = CallbackManager.Factory.create();
setUI();
}
private void setUI() {
btnFacebookLogin = (LoginButton) findViewById(R.id.btnFacebookLogin);
btnFacebookLogin.setOnClickListener(this);
btnFacebookLogin.setReadPermissions("email", "public_profile");
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btnFacebookLogin:
facebookLogin();
}
}
private void facebookLogin() {
// Callback registration
btnFacebookLogin.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
// App code
final AccessToken accessToken = loginResult.getAccessToken();
GraphRequestAsyncTask request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
@Override
public void onCompleted(JSONObject user, GraphResponse graphResponse) {
LoginManager.getInstance().logOut();
username = (user.optString("name"));
}
}).executeAsync();
Toast.makeText(getApplicationContext(), "Login Success with facebook", Toast.LENGTH_SHORT).show();
startActivity(new Intent(Userlogin .this, AlertsandPlanning.class));
}
@Override
public void onCancel() {
// App code
}
@Override
public void onError(FacebookException exception) {
// App code
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
}